A piece of copper wire is initially at 150 C. We now expose
this wire to air at 38 C. Find a) the rate of heat transfer at the moment of
exposure and b) compare this rate of heat transfer to the rate of heat transfer
from thermal radiation at the moment of exposure.
Data: For copper at 150 C; k = 374 W/m·K, c = 381 J/kg·K,
_ = 8938 kg/m3, _ = 0.8. The heat transfer coefficient is
h = 5 W/m2 ·K.
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